3.- SOLID STATE COMPONENTS

We are living in the digital era. Digital electronic is part of our daily life, however it is the evolution of analogue electronic. The basics of analogue electronic  are semiconductor materials. In this video I have explained the science of semiconductors and two components: Diode and Bipolar transistor. Indeed they haven`t many applications, but they was important in the past.




ACTIVITIES

1.- A npn transistor, has a value of B-100. Determine the operating region if

a) Vbe -0.2 V and Vce s 5 V.

We have Vbe< 0 and Vbc's Vbe - Vce's -0.2 -5 <0. In other words, the two transistor diodes are polarized in reverse and therefore the transistor must be cut.

b) ib x 50 uA (microampere) Ic x 2 mA.

The ratio Ic/Ib > 100 (B) what is only possible if the transistor is in saturation

c) Vce 5V & Ib 50 uA (microampere)

Because of the data given to us by the transistor, it must be active.

2.- A npn transistor has a value of B-100. Determine the operating region if

a) Ib 50 uA and Ic 3 mA

b) Ib 50 uA e Vce s 5V

c) Vbe-2V and Vce-1V

3.- Explain the operation of the next circuit in which there is an LDR resistor